package cn.tedu.sp11.fallback;

import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

@Component
public class ItemFB implements FallbackProvider {
    /**
     * 返回一个服务id，表示针对这个服务的降级类
     * 这回类只针对商品
     * @return
     */
    @Override
    public String getRoute() {
        return "item-service";
//        return "*";//针对所有服务降级
//        return null;//针对所有服务降级
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        //向客户端返回的降级响应   降级响应 封装在Response 对象中
        return new ClientHttpResponse() {
            //返回 200 404 500
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }
            //返回整数状态码
            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.OK.value();
            }
            // 返回 ok
            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.OK.getReasonPhrase();
            }
            @Override
            public void close() {

            }
            //协议体
            @Override
            public InputStream getBody() throws IOException {
                String json = JsonResult.ok().msg("转发调用商品服务失败").toString();
                return new ByteArrayInputStream(json.getBytes(StandardCharsets.UTF_8));

            }
            //协议头
            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h = new HttpHeaders();
                h.add("Content-type","application/json;charset=UTF-8");
                return h;
            }
        };
    }
}
